Malicious PDF — malware analysis report

Static analysis result for SHA-256 1033d79e56099761…

MALICIOUS

PDF

67.7 KB Created: 2020-11-18 01:45:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a01347755ab84beb25f6828123658f2 SHA-1: d595cae2c75a088ca160a6141a6b31caa7391ed4 SHA-256: 1033d79e56099761eb63aad313e912b7d5a11d28f7f04776ee56961ab51df931
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by an ML classifier and contains a large number of external links, a technique often used for SEO farms or to redirect users to malicious sites. One of the embedded URLs, 'https://traffking.ru/123?utm_term=fundamentals+of+hvacr+pdf', and another from the link farm, 'https://wojatobarub.weebly.com/uploads/1/3/4/6/134612389/zanenovalifawik.pdf', are considered high-priority IOCs. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to compromise users through external resources, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffking.ru/123?utm_term=fundamentals+of+hvacr+pdf
    • https://wojatobarub.weebly.com/uploads/1/3/4/6/134612389/zanenovalifawik.pdf
    • https://rukifutotusiz.weebly.com/uploads/1/3/4/6/134685592/5115779.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/webipejonavuv/ff8_remaster_100_guide.pdf
    • https://uploads.strikinglycdn.com/files/a3000b23-486c-4558-b133-342c1fe18363/self_portrait_norman_rockwell.pdf
    • https://uploads.strikinglycdn.com/files/5baec3a7-eae6-47f4-98ed-72319c568e56/skyward_family_access_walled_lake_mi.pdf
    • https://s3.amazonaws.com/wewuxuviwar/moore_norman_technology_center_job_postings.pdf
    • https://s3.amazonaws.com/dazifozixawus/vocally_inspired_performers.pdf
    • https://s3.amazonaws.com/suxiweke/letter_formation_alphabet_handwriting_practice_sheet.pdf
    • https://s3.amazonaws.com/ruzumeb/90698594387.pdf
    • https://s3.amazonaws.com/matogapibelifiv/42nd_amendment.pdf
    • https://uploads.strikinglycdn.com/files/264b9899-24ce-422f-b0de-f06c7351df69/5641293839.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbac.bin
4cc7ea093e09cb36cadc534a026c9c6697dfe878c2d3f249410fd6b4359fcd83
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAC 5408 bytes
font_01_sfnt_off0000ddf6.bin
11a2ffc1efaefa73d82bad264a25c60134937896a39f779dbbc4d5400ba2b8ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF6 10772 bytes